[sdiy] power supply

[Andre Majorel]

On 2002-07-30 16:04 -0400, Caleb Johnston wrote:
 
> This should be an easy question to answer for the experts.  I want to
> do this correctly so I dont fry anything.
> 
> I have a module that runs on 1 9V battery.  I want to run this module
> from a power supply.  The power supply is Paia's 9770u which is the
> 'unregulated +/- 18 V DC @ 350 mA.  The connections on this power
> supply are +V,G,SG,-V.  The module only has + and - for the battery.
> 
> What would be the best way to do this?  Do I need to then regulate the
> power?

Yes. You could use a 7809. The selection guide says that the
MCT7809CT can handle up to 24V at the input so it should be
fine. Connect +V to pin 1 of the 7809 and G to pin 2. Connect +
of your module to pin 3 of the 7809 and - to pin 2. You may have
to tie the 7809 to a heat sink if the module sucks too much
power (unlikely).

I'm not sure what SG is. Signal ground ??

-- 
André Majorel <amajorel at teaser.fr>
http://www.teaser.fr/~amajorel/